package com.zhongxi.guoyuan.base.http;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Looper;
import android.widget.ImageView;

import com.google.gson.Gson;
import com.google.gson.internal.$Gson$Types;
import com.squareup.okhttp.Call;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.Headers;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.MultipartBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.FileNameMap;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class OkHttpClientManager {

	private static OkHttpClientManager mInstance;
	private OkHttpClient mOkHttpClient;
	private Handler mDelivery;
	private Gson mGson;


	private static final String TAG = "OkHttpClientManager";

	private OkHttpClientManager()
	{
		mOkHttpClient = new OkHttpClient();
		//cookie enabled
		mOkHttpClient.setCookieHandler(new CookieManager(null, CookiePolicy.ACCEPT_ORIGINAL_SERVER));
		mDelivery = new Handler(Looper.getMainLooper());
		mGson = new Gson();
	}

	public static OkHttpClientManager getInstance()
	{
		if (mInstance == null)
		{
			synchronized (OkHttpClientManager.class)
			{
				if (mInstance == null)
				{
					mInstance = new OkHttpClientManager();
				}
			}
		}
		return mInstance;
	}

	/**
	 * 同步的Get请求
	 *
	 * @param url
	 * @return Response
	 */
	private Response _getAsyn(String url) throws IOException
	{
		final Request request = new Request.Builder()
				.url(url)
				.build();
		Call call = mOkHttpClient.newCall(request);
		Response execute = call.execute();
		return execute;
	}

	/**
	 * 同步的Get请求
	 *
	 * @param url
	 * @return 字符串
	 */
	private String _getAsString(String url) throws IOException
	{
		Response execute = _getAsyn(url);
		return execute.body().string();
	}


	/**
	 * 异步的get请求
	 *
	 * @param url
	 * @param callback
	 */
	private void _getAsyn(String url, final ResultCallback callback)
	{
		final Request request = new Request.Builder()
				.url(url)
				.build();
		deliveryResult(callback, request);
	}


	/**
	 * 同步的Post请求
	 *
	 * @param url
	 * @param params post的参数
	 * @return
	 */
	private Response _post(String url, Param... params) throws IOException
	{
		Request request = buildPostRequest(url, params);
		Response response = mOkHttpClient.newCall(request).execute();
		return response;
	}


	/**
	 * 同步的Post请求
	 *
	 * @param url
	 * @param params post的参数
	 * @return 字符串
	 */
	private String _postAsString(String url, Param... params) throws IOException
	{
		Response response = _post(url, params);
		return response.body().string();
	}

	/**
	 * 异步的post请求
	 *
	 * @param url
	 * @param callback
	 * @param params
	 */
	private void _postAsyn(String url, final ResultCallback callback, Param... params)
	{
		Request request = buildPostRequest(url, params);
		deliveryResult(callback, request);
	}

	/**
	 * 异步的post请求
	 *
	 * @param url
	 * @param callback
	 * @param params
	 */
	private void _postAsyn(String url, final ResultCallback callback, Map<String, String> params)
	{
		Param[] paramsArr = map2Params(params);
		Request request = buildPostRequest(url, paramsArr);
		deliveryResult(callback, request);
	}

	/**
	 * 同步基于post的文件上传
	 *
	 * @param params
	 * @return
	 */
	private Response _post(String url, File[] files, String[] fileKeys, Param... params) throws IOException
	{
		Request request = buildMultipartFormRequest(url, files, fileKeys, params);
		return mOkHttpClient.newCall(request).execute();
	}

	private Response _post(String url, File file, String fileKey) throws IOException
	{
		Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, null);
		return mOkHttpClient.newCall(request).execute();
	}

	private Response _post(String url, File file, String fileKey, Param... params) throws IOException
	{
		Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, params);
		return mOkHttpClient.newCall(request).execute();
	}

	/**
	 * 异步基于post的文件上传
	 *
	 * @param url
	 * @param callback
	 * @param files
	 * @param fileKeys
	 * @throws IOException
	 */
	private void _postAsyn(String url, ResultCallback callback, File[] files, String[] fileKeys, Param... params) throws IOException
	{
		Request request = buildMultipartFormRequest(url, files, fileKeys, params);
		deliveryResult(callback, request);
	}

	/**
	 * 异步基于post的文件上传，单文件不带参数上传
	 *
	 * @param url
	 * @param callback
	 * @param file
	 * @param fileKey
	 * @throws IOException
	 */
	private void _postAsyn(String url, ResultCallback callback, File file, String fileKey) throws IOException
	{
		Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, null);
		deliveryResult(callback, request);
	}

	/**
	 * 异步基于post的文件上传，单文件且携带其他form参数上传
	 *
	 * @param url
	 * @param callback
	 * @param file
	 * @param fileKey
	 * @param params
	 * @throws IOException
	 */
	private void _postAsyn(String url, ResultCallback callback, File file, String fileKey, Param... params) throws IOException
	{
		Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, params);
		deliveryResult(callback, request);
	}

	/**
	 * 异步下载文件
	 *
	 * @param url
	 * @param destFileDir 本地文件存储的文件夹
	 * @param callback
	 */
	private void _downloadAsyn(final String url, final String destFileDir, final ResultCallback callback)
	{
		final Request request = new Request.Builder()
				.url(url)
				.build();
		final Call call = mOkHttpClient.newCall(request);
		call.enqueue(new Callback()
		{
			@Override
			public void onFailure(final Request request, final IOException e)
			{
				sendFailedStringCallback(request, e, callback);
			}

			@Override
			public void onResponse(Response response)
			{
				InputStream is = null;
				byte[] buf = new byte[2048];
				int len = 0;
				FileOutputStream fos = null;
				try
				{
					is = response.body().byteStream();
					File file = new File(destFileDir, getFileName(url));
					fos = new FileOutputStream(file);
					while ((len = is.read(buf)) != -1)
					{
						fos.write(buf, 0, len);
					}
					fos.flush();
					//如果下载文件成功，第一个参数为文件的绝对路径
					sendSuccessResultCallback(file.getAbsolutePath(), callback);
				} catch (IOException e)
				{
					sendFailedStringCallback(response.request(), e, callback);
				} finally
				{
					try
					{
						if (is != null) is.close();
					} catch (IOException e)
					{
					}
					try
					{
						if (fos != null) fos.close();
					} catch (IOException e)
					{
					}
				}

			}
		});
	}

	private String getFileName(String path)
	{
		int separatorIndex = path.lastIndexOf("/");
		return (separatorIndex < 0) ? path : path.substring(separatorIndex + 1, path.length());
	}

	/**
	 * 加载图片
	 *
	 * @param view
	 * @param url
	 * @throws IOException
	 */
	private void _displayImage(final ImageView view, final String url, final int errorResId)
	{
		final Request request = new Request.Builder()
				.url(url)
				.build();
		Call call = mOkHttpClient.newCall(request);
		call.enqueue(new Callback()
		{
			@Override
			public void onFailure(Request request, IOException e)
			{
				setErrorResId(view, errorResId);
			}

			@Override
			public void onResponse(Response response)
			{
				InputStream is = null;
				try
				{
					is = response.body().byteStream();
					ImageUtils.ImageSize actualImageSize = ImageUtils.getImageSize(is);
					ImageUtils.ImageSize imageViewSize = ImageUtils.getImageViewSize(view);
					int inSampleSize = ImageUtils.calculateInSampleSize(actualImageSize, imageViewSize);
					try
					{
						is.reset();
					} catch (IOException e)
					{
						response = _getAsyn(url);
						is = response.body().byteStream();
					}

					BitmapFactory.Options ops = new BitmapFactory.Options();
					ops.inJustDecodeBounds = false;
					ops.inSampleSize = inSampleSize;
					final Bitmap bm = BitmapFactory.decodeStream(is, null, ops);
					mDelivery.post(new Runnable()
					{
						@Override
						public void run()
						{
							view.setImageBitmap(bm);
						}
					});
				} catch (Exception e)
				{
					setErrorResId(view, errorResId);

				} finally
				{
					if (is != null) try
					{
						is.close();
					} catch (IOException e)
					{
						e.printStackTrace();
					}
				}
			}
		});


	}

	private void setErrorResId(final ImageView view, final int errorResId)
	{
		mDelivery.post(new Runnable()
		{
			@Override
			public void run()
			{
				view.setImageResource(errorResId);
			}
		});
	}


	//*************对外公布的方法************


	public static Response getAsyn(String url) throws IOException
	{
		return getInstance()._getAsyn(url);
	}


	public static String getAsString(String url) throws IOException
	{
		return getInstance()._getAsString(url);
	}

	public static void getAsyn(String url, ResultCallback callback)
	{
		getInstance()._getAsyn(url, callback);
	}

	public static Response post(String url, Param... params) throws IOException
	{
		return getInstance()._post(url, params);
	}

	public static String postAsString(String url, Param... params) throws IOException
	{
		return getInstance()._postAsString(url, params);
	}

	public static void postAsyn(String url, final ResultCallback callback, Param... params)
	{
		getInstance()._postAsyn(url, callback, params);
	}


	public static void postAsyn(String url, final ResultCallback callback, Map<String, String> params)
	{
		getInstance()._postAsyn(url, callback, params);
	}


	public static Response post(String url, File[] files, String[] fileKeys, Param... params) throws IOException
	{
		return getInstance()._post(url, files, fileKeys, params);
	}

	public static Response post(String url, File file, String fileKey) throws IOException
	{
		return getInstance()._post(url, file, fileKey);
	}

	public static Response post(String url, File file, String fileKey, Param... params) throws IOException
	{
		return getInstance()._post(url, file, fileKey, params);
	}

	public static void postAsyn(String url, ResultCallback callback, File[] files, String[] fileKeys, Param... params) throws IOException
	{
		getInstance()._postAsyn(url, callback, files, fileKeys, params);
	}


	public static void postAsyn(String url, ResultCallback callback, File file, String fileKey) throws IOException
	{
		getInstance()._postAsyn(url, callback, file, fileKey);
	}


	public static void postAsyn(String url, ResultCallback callback, File file, String fileKey, Param... params) throws IOException
	{
		getInstance()._postAsyn(url, callback, file, fileKey, params);
	}

	public static void displayImage(final ImageView view, String url, int errorResId) throws IOException
	{
		getInstance()._displayImage(view, url, errorResId);
	}


	public static void displayImage(final ImageView view, String url)
	{
		getInstance()._displayImage(view, url, -1);
	}

	public static void downloadAsyn(String url, String destDir, ResultCallback callback)
	{
		getInstance()._downloadAsyn(url, destDir, callback);
	}

	//****************************


	private Request buildMultipartFormRequest(String url, File[] files,
											  String[] fileKeys, Param[] params)
	{
		params = validateParam(params);

		MultipartBuilder builder = new MultipartBuilder()
				.type(MultipartBuilder.FORM);

		for (Param param : params)
		{
			builder.addPart(Headers.of("Content-Disposition", "form-data; name=\"" + param.key + "\""),
					RequestBody.create(null, param.value));
		}
		if (files != null)
		{
			RequestBody fileBody = null;
			for (int i = 0; i < files.length; i++)
			{
				File file = files[i];
				String fileName = file.getName();
				fileBody = RequestBody.create(MediaType.parse(guessMimeType(fileName)), file);
				builder.addPart(Headers.of("Content-Disposition",
						"form-data; name=\"" + fileKeys[i] + "\"; filename=\"" + fileName + "\""),
						fileBody);
			}
		}

		RequestBody requestBody = builder.build();
		return new Request.Builder()
				.url(url)
				.post(requestBody)
				.build();
	}

	private String guessMimeType(String path)
	{
		FileNameMap fileNameMap = URLConnection.getFileNameMap();
		String contentTypeFor = fileNameMap.getContentTypeFor(path);
		if (contentTypeFor == null)
		{
			contentTypeFor = "application/octet-stream";
		}
		return contentTypeFor;
	}


	private Param[] validateParam(Param[] params)
	{
		if (params == null)
			return new Param[0];
		else return params;
	}

	private Param[] map2Params(Map<String, String> params)
	{
		if (params == null) return new Param[0];
		int size = params.size();
		Param[] res = new Param[size];
		Set<Map.Entry<String, String>> entries = params.entrySet();
		int i = 0;
		for (Map.Entry<String, String> entry : entries)
		{
			res[i++] = new Param(entry.getKey(), entry.getValue());
		}
		return res;
	}

	private static final String SESSION_KEY = "Set-Cookie";
	private static final String mSessionKey = "JSESSIONID";

	private Map<String, String> mSessions = new HashMap<String, String>();

	private void deliveryResult(final ResultCallback callback, Request request)
	{
		mOkHttpClient.newCall(request).enqueue(new Callback()
		{
			@Override
			public void onFailure(final Request request, final IOException e)
			{
				sendFailedStringCallback(request, e, callback);
			}

			@Override
			public void onResponse(final Response response)
			{
				try
				{
					final String string = response.body().string();
					if (callback.mType == String.class)
					{
						sendSuccessResultCallback(string, callback);
					} else
					{
						Object o = mGson.fromJson(string, callback.mType);
						sendSuccessResultCallback(o, callback);
					}


				} catch (IOException e)
				{
					sendFailedStringCallback(response.request(), e, callback);
				} catch (com.google.gson.JsonParseException e)//Json解析的错误
				{
					sendFailedStringCallback(response.request(), e, callback);
				}

			}
		});
	}

	private void sendFailedStringCallback(final Request request, final Exception e, final ResultCallback callback)
	{
		mDelivery.post(new Runnable()
		{
			@Override
			public void run()
			{
				if (callback != null)
					callback.onError(request, e);
			}
		});
	}

	private void sendSuccessResultCallback(final Object object, final ResultCallback callback)
	{
		mDelivery.post(new Runnable()
		{
			@Override
			public void run()
			{
				if (callback != null)
				{
					callback.onResponse(object);
				}
			}
		});
	}

	private Request buildPostRequest(String url, Param[] params)
	{
		if (params == null)
		{
			params = new Param[0];
		}
		FormEncodingBuilder builder = new FormEncodingBuilder();
		for (Param param : params)
		{
			builder.add(param.key, param.value);
		}
		RequestBody requestBody = builder.build();
		return new Request.Builder()
				.url(url)
				.post(requestBody)
				.build();
	}


	public static abstract class ResultCallback<T>
	{
		Type mType;

		public ResultCallback()
		{
			mType = getSuperclassTypeParameter(getClass());
		}

		static Type getSuperclassTypeParameter(Class<?> subclass)
		{
			Type superclass = subclass.getGenericSuperclass();
			if (superclass instanceof Class)
			{
				throw new RuntimeException("Missing type parameter.");
			}
			ParameterizedType parameterized = (ParameterizedType) superclass;
			return $Gson$Types.canonicalize(parameterized.getActualTypeArguments()[0]);
		}

		public abstract void onError(Request request, Exception e);

		public abstract void onResponse(T response);
	}

	public static class Param
	{
		public Param()
		{
		}

		public Param(String key, String value)
		{
			this.key = key;
			this.value = value;
		}

		String key;
		String value;
	}

}
